Effect of C/N on partial nitrification in an MBBR at low temperature

2020 ◽  
Vol 6 (12) ◽  
pp. 3391-3399
Author(s):  
Fan Ding ◽  
Dongbo Liang ◽  
Yaodong Wu ◽  
Dongyue Li ◽  
Wei Bian ◽  
...  
Keyword(s):  
Low Temperature ◽  
Partial Nitrification ◽  
Start Up

An appropriate amount of C/N is crucial for the start-up and stabilization of partial nitrification at low temperature.

scholarly journals Start-up Strategies for Anaerobic Ammonia Oxidation (Anammox) in In-Situ Nitrogen Removal from Polluted Groundwater in Rare Earth Mining Areas

2021 ◽  
Vol 13 (8) ◽  
pp. 4591
Author(s):  
Shuanglei Huang ◽  
Daishe Wu
Keyword(s):  
Rare Earth ◽  
Low Temperature ◽  
Removal Efficiency ◽  
Nitrogen Removal ◽  
Ex Situ ◽  
High Concentration ◽  
Low Concentration ◽  
Start Up ◽  
Anammox Activity

The tremendous input of ammonium and rare earth element (REE) ions released by the enormous consumption of (NH4)2SO4 in in situ leaching for ion-adsorption RE mining caused serious ground and surface water contamination. Anaerobic ammonium oxidation (anammox) was a sustainable in situ technology that can reduce this nitrogen pollution. In this research, in situ, semi in situ, and ex situ method of inoculation that included low-concentration (0.02 mg·L−1) and high-concentration (0.10 mg·L−1) lanthanum (La)(III) were adopted to explore effective start-up strategies for starting up anammox reactors seeded with activated sludge and anammox sludge. The reactors were refrigerated for 30 days at 4 °C to investigate the effects of La(III) during a period of low-temperature. The results showed that the in situ and semi in situ enrichment strategies with the addition of La(III) at a low-concentration La(III) addition (0.02 mg·L−1) reduced the length of time required to reactivate the sludge until it reached a state of stable anammox activity and high nitrogen removal efficiency by 60–71 days. The addition of La(III) promoted the formation of sludge floc with a compact structure that enabled it to resist the adverse effects of low temperature and so to maintain a high abundance of AnAOB and microbacterial community diversity of sludge during refrigeration period. The addition of La(III) at a high concentration caused the cellular percentage of AnAOB to decrease from 54.60 ± 6.19% to 17.35 ± 6.69% during the enrichment and reduced nitrogen removal efficiency to an unrecoverable level to post-refrigeration.

scholarly journals A strategy to speed up formation and strengthen activity of biofilms at low temperature

RSC Advances ◽  
2017 ◽  
Vol 7 (37) ◽  
pp. 22788-22796 ◽  
Author(s):  
Huizhi Hu ◽  
Junguo He ◽  
Huarong Yu ◽  
Jian Liu ◽  
Jie Zhang
Keyword(s):  
Low Temperature ◽  
Biofilm Reactors ◽  
Start Up ◽  
Long Time ◽  
Speed Up

The start-up period of biofilm reactors often takes a long time to obtain a mature and stable biofilm, especially at low temperature.

Quick start-up of membrane bioreactor for treating micro-polluted surface water under low temperature

2014 ◽  
Vol 63 (5) ◽  
pp. 350-357
Author(s):  
Haiqing Chang ◽  
Fangshu Qu ◽  
Heng Liang ◽  
Ruibao Jia ◽  
Wei Gao ◽  
...  
Keyword(s):  
Surface Water ◽  
Low Temperature ◽  
Membrane Bioreactor ◽  
Start Up

Efficient and integrated start-up strategy for partial nitrification to nitrite treating low C/N domestic wastewater

2009 ◽  
Vol 60 (12) ◽  
pp. 3243-3251 ◽  
Author(s):  
Jianhua Guo ◽  
Shuying Wang ◽  
Huijun Huang ◽  
Yongzhen Peng ◽  
Shijian Ge ◽  
...  
Keyword(s):  
Domestic Wastewater ◽  
Kinetic Mechanism ◽  
Partial Nitrification ◽  
Nitrifying Bacteria ◽  
Nitrite Accumulation ◽  
Fish Analysis ◽  
Batch Reactors ◽  
Sequencing Batch Reactors ◽  
Start Up ◽  
Operation Results

Nitrogen removal via the nitrite pathway has the potential of reducing the requirements for aeration consumption and carbon source. However, the development of an efficient and quick start-up strategy for partial nitrification to nitrite has proven difficult in the treatment of low strength wastewater. In this study, the feasibility of partial nitrification achieved by using real-time aeration duration control was not only demonstrated from the kinetic mechanism, but also was validated in three sequencing batch reactors (SBRs) fed with low C/N domestic wastewater. Nitrite accumulation could be achieved when aeration was terminated as soon as an inflexion pH point was reached (the dpH/dt became from negative to positive). The reduction or limitation of the NOB growth could be achieved through aeration duration control, due to leaving no extra time for NOB to convert the accumulated nitrite. The experimental operation results also showed that partial nitrification with nitrite accumulation ratios of over 80% was achieved successfully in these three reactors with process control. Fluorescence in situ hybridization (FISH) analysis indicated the reduction of NOB was achieved and AOB became the dominant nitrifying bacteria. Moreover, an integrated start-up strategy based on aeration duration control was proposed to quickly achieve partial nitrification to nitrite.

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